Efetue as adições!
Lembre-se que somar um número positivo é mesmo que somar o número + (+a) = +a e;
Lembre-se que somar um número negativo é mesmo que subtrair o número + (-a) = - a
a) 17 + (-21) = b) -17 + (-21) = c) - 17 + (+21) = d) 17 + (+21) =
e) (-5) + (-19) = f) -8 + (-5) = g) (+3) + (-9) = h) (-12) + (-34) =
i) (+52) + (-63) = j) (-78) + (-221) = l) (+76) + (-91) = m) 17 + (-21) =

30 points and i will give brainliest the club will base its decision about whether to increase the budget for the indoor rock climbing facility on the analysis of its usage. the decision to increase the budget will depend on whether members are using the indoor facility at least two times a week. use the best measure of center for both data sets to determine whether the club should increase the budget. assume there are four weeks in a month. if you think the data is inconclusive, explain why.

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10

Solve the problem by making up an equation. a man could arrive on time for an appointment if he drove the car at 40 mph; however, since he left the house 15 minutes late, he drove the car at 50 mph and arrive 3 minutes early for the appointment. how far from his house was his appointment?